diff --git a/gdk-pixbuf/io-jpeg.c b/gdk-pixbuf/io-jpeg.c
index 5435f5b252..07308e3706 100644
--- a/gdk-pixbuf/io-jpeg.c
+++ b/gdk-pixbuf/io-jpeg.c
@@ -922,6 +922,7 @@ gdk_pixbuf__jpeg_image_load_increment (gpointer data,
 			}
 			
 			for (cinfo->scale_denom = 2; cinfo->scale_denom <= 8; cinfo->scale_denom *= 2) {
+				cinfo->scale_num = 1;
 				jpeg_calc_output_dimensions (cinfo);
 				if (cinfo->output_width < width || cinfo->output_height < height) {
 					cinfo->scale_denom /= 2;